1. Resource
1.1. http://blog.hafees.com/windows/windows-linux-and-mac-a-comparison/
2. Windows7
2.1. Pros
2.1.1. Most popular operating system
2.2. Cons
2.2.1. Easy to use – I think, this is because most computer users started their computing with Windows and are familiar with it. However, for a hard core Linux user, Windows may be difficult to use, cluttered, unorganized Operating System.
2.2.2. Not free, restricted, no freedom
2.2.3. Not very stable – Windows is synonymous with the infamous "Blue screen of death" (BSOD). But Windows XP has changed this to an extend as it was reported as the most stable OS by Microsoft.
3. Ubuntu
3.1. Pros
3.1.1. Free software – No cost, no restrictions – complete freedom.
3.1.2. Excellent community – Most of the Linux distributions (or simply called as a distro), especially Ubuntu has excellent community support. So if you ran into a problem, just seek help from the community.
3.2. Cons
3.2.1. May be difficult to decide which Linux flavor. The options are plenty and a ‘non techie’ user may be confused to choose the right distro. But Linux has an excellent community and just ask your questions in the forums or user groups. You can always find a linux distro for almost all of your need.
3.2.2. Installation may be difficult if your hardware is not standard (less available or less popular). You might need to recompile the kernel to support your hardware. This can become a nightmare for an average user. But chances are high that, the same problem has occurred for another user and the linux community has already solved this. So just google around and find the solution.
4. Resources
5. Chromium
5.1. is the open source development version of Google's Chrome OS. Chrome OS's source code was released on November 19, 2009 under the BSD license as Chromium OS.[3
6. Mac OS X
6.1. Pros
6.1.1. Excellent user interface and usability
6.1.2. Applications – A large number of excellent professional applications are available in this platform and hence preferred by designers and other professionals.
6.2. Cons
6.2.1. Though, based on open source operating systems, it is still proprietary.
6.2.2. Cost of ownership is high – User is not free to try it out by paying for the operating system alone, instead the user is forced to buy new hardware at premium prices.